Forty years after Roe v. Wade, Planned Parenthood and its critics — including U.S. Reps. Marsha Blackburn and Diane Black — are engaged in a fierce brand war.

The billion-dollar charity wants to protect its image as a trusted health-care provider and advocate for women. Its critics say the nation’s largest abortion provider is a rogue organization that misuses federal funds.

At stake is more than $500 million in government funds for Planned Parenthood’s health care, prevention, and education programs. Those funds can’t be used for abortion.